port of telescope commit 1470eab31452d2fab50bc4965320dab7892b2ef3 original commit message: > on libevent2 we need to wrap evbuffer_add with > evbuffer_freeze/evbuffer_unfreeze. Not sure exactly why, probably > because we're doing some evbuffer_enable/disable/enable-again.

STAILQ_* macros seems to be more widespread than SIMPLEQ_*

With this it automatically check if it's possible to link to to libbsd, using libbsd-ctor to avoid cluttering the sources.

it doesn't seem to work on guix, I don't feel fine editing crypto-related code and it was only used to generate a random id for clients connection. I'd love if someone will solve this thought :)